To design your van furnitures, you can rely on paper, pen, ruler and compass … or you can do it using FreeCad 😉
It’s an Open Source, multi-OS. You’ll have to take a little time to train a bit as this kind of software isn’t very easy to understand and use, but when you finally got the fundamentals, it’s really better than paper and pen !
Above is an example with 30mmx30mmx1.5mm steel tube….